/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * http://www.gnu.org/copyleft/gpl.html
 */
package l1j.jrwz.server.utils;

import java.util.Iterator;
import java.util.NoSuchElementException;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class IterableElementList implements Iterable<Element> {
    private class MyIterator implements Iterator<Element> {
        private Iterator<Node> _itr;
        private Element _next = null;

        public MyIterator(Iterator<Node> itr) {
            _itr = itr;
            updateNextElement();
        }

        @Override
        public boolean hasNext() {
            return _next != null;
        }

        @Override
        public Element next() {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            Element result = _next;
            updateNextElement();
            return result;
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }

        private void updateNextElement() {
            while (_itr.hasNext()) {
                Node node = _itr.next();
                if (node instanceof Element) {
                    _next = (Element) node;
                    return;
                }
            }
            _next = null;
        }
    }

    IterableNodeList _list;

    public IterableElementList(NodeList list) {
        _list = new IterableNodeList(list);
    }

    @Override
    public Iterator<Element> iterator() {
        return new MyIterator(_list.iterator());
    }

}
